Accession Number : AD0829019

Title :   ESTIMATION OF TURBULENT HEAT TRANSFER AT THE SONIC POINT OF A BLUNT-NOSED BODY.

Descriptive Note : Research note,

Corporate Author : CONVAIR SCIENTIFIC RESEARCH LAB SAN DIEGO CA

Personal Author(s) : Sibulkin, Merwin

Report Date : OCT 1957

Pagination or Media Count : 37

Abstract : An equation is derived from a turbulent-boundary-layer analysis for the convective heat transfer at the sonic point of a blunt-nosed body in terms of conditions at the sonic point. The analysis is continued to give the heat transfer in terms of conditions at the stagnation point for the case of a perfect gas (which is straightforward) and for the dissociated air flow occurring at hypersonic flight velocities. For rapid estimation purposes, a 'very approximate solution' is developed for hypersonic speeds which involves only the free-stream velocity and density and the radius of curvature at the sonic point. The results obtained from the different solutions are compared for a sample calculation. As part of the dissociated air flow solution, a method for determining the flow conditions at the sonic point in terms of an average isentropic exponent is presented. Using this method and an assumed Newtonian pressure distribution, an equation is derived for the inviscid-flow velocity gradient at the sonic point. (Author)

Descriptors :   *HEAT TRANSFER), (*BLUNT BODIES, MATHEMATICAL ANALYSIS, TURBULENCE, BLUNT BODIES, CONVECTION(HEAT TRANSFER), STAGNATION POINT, HYPERSONIC FLIGHT, DISSOCIATION, BOUNDARY LAYER TRANSITION, HYPERSONIC CHARACTERISTICS, LAMINAR FLOW, SHOCK WAVES, BOUNDARY LAYER, TRANSONIC FLOW.

Subject Categories : Fluid Mechanics
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE